While a locomotive could be -- with a LOT of stretch of imagination -- thought to be both fiery and snuffy, I am pretty confident the context would not support your teacher's opinion, which I am willing to also bet was unsubstantiated.

I have always tended in my own thoughts toward the notion of them being differently behave dogies, as described above by "a pard" of Don's. But that is also an opinion baed on context.

Wish we had an authoritative answer. Will advise if I find one!


A